Ok quick recap of my pool, inground concrete pool.
After trying to open the pool for the last 2 weeks, the water in samples is clear but the pool is green and slightly cloudy my levels today are:

Chl 5 (highest my test kit will go)
ph 7.8
Alk 12
CYA 80
hardness zero

the hardness test says that when the indictor is added the sample should turn red if hardness is present, well mine doesn't. Zero hardness. What can I do to get the hardness up? Trip to the pool store?

Advice, help, tips?